NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days — NPA 730
NEW CINGULAR WIRELESS PCS, LLC - IL 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2023-11-13 730-228 0–9 XXXall 10 · 2 holders which blocks → IP HORIZON LLC 515J OLNEY IL
2023-10-13 730-227 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA IL
2023-10-12 730-226 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLLINSVL IL
2023-10-06 730-225 1XXX3XXX4XXX · 2 holders which blocks → CALLWORKS CORPORATION 475J CAIRO IL
2023-09-28 730-221 0XXX1XXX2XXX3XXX4XXX8XXX · 2 holders which blocks → COMMIO, LLC 939H BROOKPORT IL
2023-09-28 730-222 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → COMMIO, LLC 939H DE SOTO IL
2023-09-28 730-223 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → COMMIO, LLC 939H GOREVILLE IL
2023-09-28 730-224 0XXX1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → COMMIO, LLC 939H KARNAK IL
2023-09-14 730-220 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA IL
2023-09-12 730-209 0XXX2XXX3XXX · 2 holders which blocks → ONVOY, LLC 224C BRUSSELS IL
2023-09-12 730-210 2XXX3XXX7XXX · 3 holders which blocks → ONVOY, LLC 224C BELLMONT IL
2023-09-12 730-212 0XXX1XXX2XXX · 3 holders which blocks → ONVOY, LLC 224C INA IL
2023-09-12 730-213 0XXX1XXX2XXX4XXX · 4 holders which blocks → ONVOY, LLC 224C KELL IL
2023-09-12 730-214 0XXX1XXX2XXX · 3 holders which blocks → ONVOY, LLC 224C KINMUNDY IL
2023-09-12 730-215 0XXX1XXX2XXX8XXX · 4 holders which blocks → ONVOY, LLC 224C MULBRY GRV IL
2023-09-12 730-216 0XXX1XXX2XXX3XXX · 4 holders which blocks → ONVOY, LLC 224C PATOKA IL
2023-09-12 730-217 0XXX1XXX2XXX · 3 holders which blocks → ONVOY, LLC 224C SHATTUC IL
2023-09-12 730-218 0XXX1XXX2XXX · 3 holders which blocks → ONVOY, LLC 224C ST PETER IL
2023-09-12 730-219 0XXX2XXX · 2 holders which blocks → ONVOY, LLC 224C WOODBURN IL
2023-09-11 730-208 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERRIN IL
2023-09-06 730-202 0XXX2XXX3XXX · 3 holders which blocks → ONVOY, LLC 224C RALEGHGLTI IL
2023-09-06 730-203 0XXX2XXX3XXX · 3 holders which blocks → ONVOY, LLC 224C SHAWNEETN IL
2023-09-06 730-204 2XXX3XXX · 2 holders which blocks → ONVOY, LLC 224C VILLARIDGE IL
2023-09-06 730-205 2XXX3XXX5XXX · 3 holders which blocks → ONVOY, LLC 224C DONGOLA IL
2023-09-06 730-206 0XXX1XXX2XXX3XXX · 4 holders which blocks → ONVOY, LLC 224C RIDGWAY IL
2023-09-06 730-207 0XXX1XXX2XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C IUKA IL
2023-08-23 730-200 0XXX2XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C KASKASKIA IL
2023-08-23 730-201 2XXX3XXX · 2 holders which blocks → ONVOY, LLC 224C CHRISTOPHR IL
— 730-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 730-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 730-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 730-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 730-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST IL
— 730-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 730-700 not yet reported which blocks → IL
— 730-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 730-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 730-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 730-950 not yet reported which blocks → IL
— 730-958 not yet reported which blocks → IL
— 730-959 not yet reported which blocks → IL
— 730-976 not yet reported which blocks → IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.